Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5d79e38dea8b19…

MALICIOUS

PDF

84.4 KB Created: 2021-02-15 18:24:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 73aadd594601a9863eb4e7df3f905706 SHA-1: 5d72280a80563237a40e02d9da602cac5c61ddb9 SHA-256: 9e5d79e38dea8b19214f74024d4fa38e7d2259a4307fdaf3544e2e020d59c22c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and extensive external linking indicate an attempt to redirect users to potentially harmful content, possibly as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/wb?keyword=dnd%205e%20scholar%20pack%20vs%20explorer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453740/normal_5fd73b700f09c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414848/normal_6005e95e5ce6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_5fd90040ab580.pdfIn PDF document text
    • https://vusowosunuk.weebly.com/uploads/1/3/5/9/135975823/sazake-rigagax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450514/normal_6023f88754308.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476924/normal_5fcd17d62cd8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479904/normal_600299ab34d76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408004/normal_5ffcc11a93b5a.pdfIn PDF document text
    • https://godivibodo.weebly.com/uploads/1/3/4/0/134040440/6637462.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369776/normal_5ff184fc9d165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_6027354876a3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_6010f3c9d1e08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_5fd7be0bd1fd8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gurafoga/61891449591.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/tv_guide_tasmania_saturday.pdfIn PDF document text
    • http://xuwuxubemepimox.rf.gd/aha_guidelines_pediatric_pulmonary_hypertension.pdfIn PDF document text
    • http://mimonutemabase.epizy.com/best_booting_app_for_android.pdfIn PDF document text
    • http://tubupokus.rf.gd/csulb_campus_map.pdfIn PDF document text
    • http://zurinelu.epizy.com/xatuxakeviginixilileg.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 5508 bytes
SHA-256: d2e1bddbc0b618afceb5413d2f6963e72fc14ba6ed5fae97662285bb86f51e1b
font_01_sfnt_off00011f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8F 10604 bytes
SHA-256: 320f41b984fd4b027d1c1382aaf406f81614133dd84cbd50ed8776334f3ae1d7

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